The best I have witnessed (not first hand) was, as Geoff suggested, using an
ebay "power lister" agent /middleman.
Something along the lines, you sell by Page / Pages, you supply the images,
the agent lists and sells on
ebay, and takes an agreed commission.
The example I refer to, the vendor and agent were known to each other, the collection was substantial, and the result was praised by the vendor. (netted above $20,000 if I recall correctly)
How you select your agent for expertise,
ebay knowledge and faithful personal customers to the agent, will be the tricky part.
Quote:
Maybe selling some better sets singly
I don't favour this method,
for the "progressing collector", a page/pages of stamps, can be appraised by the
prospective buyer, for gaps in his/her own collection, and will be a stronger influence to purchase, rather than singe good sets, which then, you are left with stamp oddments of lower rated examples.
Full page/pages, make good "window dressing" for potential buyers.